Papers by Keyword: Biomimetic Method

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Authors: Mariny F.C. Coelho, Maria E.R. Cronemberger, Juliete N. Pereira, Sandra Nakamatsu, Sylma Carvalho Maestrelli, Eliana C. da S. Rigo, Neide A. Mariano
Abstract: Titanium and stainless steel are examples of biomaterials widely used in dental and orthopedic implants owing to their properties of good corrosion resistance and excellent biocompatibility. This paper reports on a study of the biomimetic method applied to titanium (cp-Ti) and 316L stainless steel. The method consists in immersing the metal substrate in a synthetic solution of SBF (simulated body fluid) whose composition, pH and temperature resemble those of human blood plasma. The coating on the two metals was effective for obtaining hydroxyapatite, which was confirmed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR).
Authors: Yong Hua Wang, Cheng Chun Zhang, Lu Quan Ren, Mohamed Ichchou, Marie Annick Galland, Olivier Bareille
Abstract: The interest of this paper lies in the proposition of using bionic method to develop a new sound absorption structure. Inspired by the coupling absorption structure of the skin and feather of a typical silent flying bird – owl, a bionic coupling multi-layer structure model is developed, which is composed of a micro-silt plate, porous fibrous material and a flexible micro-perforated membrane backed with airspace. The impedance transfer method is applied to calculate the absorption coefficients and analyze the influences of different parameters of each layer on absorption coefficients of this model. Based on numerical simulations, the effectiveness of this proposed model is tested. The average absorption coefficient reaches 0.85 within the frequency range from 200 Hz to 2000 Hz. The significant improvement of absorption coefficients can be mainly due to the Helmholtz effects of the micro-silt plate and flexible micro-perforated membrane, and the combination with porous materials can lead to even better absorption performance in broadband.
Authors: Seiji Yamaguchi, Takeshi Yabutsuka, Mitsuhiro Hibino, Takeshi Yao
Abstract: Apatite pattern was prepared by electrophoretic deposition (EPD) transcribing resist pattern. A porous polytetrafluoroethylene (PTFE) film was used as a substrate and attached on a cathode. The cathode for EPD was stainless plate with resist pattern. EPD was performed with a suspension of wollastonite particles in acetone and wollastonite particles were deposited on the substrate in the form of the resist pattern. When the wollastonite-deposited substrate was soaked in simulated body fluid (SBF), apatite was induced and then replaced wollastonite at the wollastonite deposited region on the substrate. As a result, apatite was formed in the pattern that traced the resist pattern. The minimum line width of the apatite pattern was about 100 µm.
Authors: Seiji Yamaguchi, Takeshi Yao
Abstract: Electrophoretic deposition (EPD) was applied to forming apatite pattern. A pattern of holes was formed on a polytetrafluoroethylene (PTFE) board and a porous PTFE film was superposed on the PTFE board. Wollastonite particles were deposited on the PTFE film by EPD and wollastonite pattern was obtained. Then apatite was induced at the wollastonite deposited region by soaking in a simulated body fluid.
Authors: Francesco Branda, A. Costantini, Giuseppina Luciani, G. Laudisio, L. Ambrosio, Lia Rimondini
Authors: Dora A. Cortés-Hernández, José C. Escobedo-Bocardo, Akemi A. Nogiwa-Valdez, R. Muñoz
Authors: E.C.S. Rigo, M.C. Bottino, B.D. Carraro, Elisa B. Taddei, Vinicius André Rodrigues Henriques, Cosme Roberto Moreira Silva, Ana Helena A. Bressiani, José Carlos Bressiani
Abstract: Comparing to hydroxyapatite (HA), which forms a strong chemical bond with the bony tissues, metallic materials are not able to bond with bone. For this reason, a great variety of complex coating methods, such as pulse-laser deposition, ion-beam assisted deposition and plasma-spray has been used to form a HA layer onto metallic surfaces. This study evaluated the performance of the biomimetic technique on apatite-based coating formation on two Tialloys. Ti-13Nb-13Zr and Ti-35Nb-7Zr-5Ta were obtained via powder metallurgy. The Tibased alloys were biomimetically coated using a technique which was modified from the conventional ones using a sodium silicate solution as the nucleant agent. Both alloys presented similar behavior in the evaluated conditions which means the formation of a homogeneous and well defined HA coating. These results show that these new non-toxic Tialloys seem to be very promising for biomedical applications.
Authors: Hiroto Mizutani, Takeshi Yabutsuka, Shigeomi Takai, Takeshi Yao
Abstract: When the pH or the temperature of a simulated body fluid (SBF) is raised, fine particles of calcium phosphate are precipitated. We found that this particle actively induces apatite formation in body fluid or SBF and named it Apatite Nucleus (AN). In this study, we fabricated bone-like apatite self-supporting thin film by biomimetic method using AN. We analyzed it by FE-SEM, EDX, TF-XRD and ICP. It was found that the film has similar crystallinity and Ca/P ratio to those of biological apatite and ca. 10 μm of thickness.
Authors: Takeshi Yabutsuka, Shinichiro Tsuboi, Mitsuhiro Hibino, Takeshi Yao
Abstract: Apatite nuclei were synthesized by raising pH of simulated body fluid (SBF). The apatite nuclei were attached to surfaces of Ag microspheres. Hydroxyapatite (HAp) was induced from the apatite nuclei and spread over whole surface area of the Ag microspheres in SBF, then encapsulated Ag microspheres with HAp were fabricated. The encapsulated Ag microspheres with HAp were soaked in saline and changes in Ag ion concentration in saline were measured. The encapsulated Ag microspheres with HAp showed sustained-release of Ag ion.
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